Two-compartment envelope



E. W. BURKE TWO-COMPARTMENT ENVELOPE Nov. 30 1926.

Filed Dec. 26, 1922 Patented Nov. 30, 192 6 UNITED?ST ATES nnwenn w. BURKE, or nocxvrnnn, connnorrcn'r, essrenon To UNITED s'rn'r'ns" 1,e09,010 PATENT- ori ice.

ENVELOPE COMPANY, OF SPRINGFIELD, MASSACHUSETTS, A CORPORATION .OF

MAINE.

Application filed December The invention contemplates an envelope 1 structure providing a compartment or'pocket of large size to receive bulky matter, such machines which are employed in as merchandise, catalogues, and-the like, which are mailable at a low postal rate, and integral therewith, and within the area of said large compartment, a smaller compartment or pocket, capable of being securely sealed, and adapted to contain. the invoice, bill, letter, or the like, which, though mailable only at a higher postal rate, it isdesired to transmit with'the bulky matter, under one and the same 'address. According to the in vention, such a two compartment envelope structure is susceptible of formation from a single sheet or blank, and withal, under such simple requirements for gumming, folding and sealing, as to render quantity production entirely feasible -by the automatic the manufacture of standard envelopes. These and other advantageous features of the invention 'will hereinafter more fullyappear, reference being had to the"accompany1ng drawings, in which-- M Fig. 1 shows a two'compartment envelope constructed in accordance with the inventlOIl. I

Fig. 2 shows a blank, in flat or extended position, before'folding, from'which the envelope of Fig. 1 is made.

Fig. 3 shows the envelope on a smaller scale, in readiness for mailing and with postage aflixed to the two compartments.

Like reference characters refer to like parts in the different figures.

' Referring first to ig.. 2, the envelope blank provides a body portion -1, constituting, 'when'the blank is folded, the unseamed face or, as it is sometimes called, the front "portion of the envelope; 'At the ends of the portion 1 are the flaps 2 and 3, the last named beingygummed, as shown at 4, to provide,

Y when folded; the bottom seam of the larger compartment; One wall of this larger comrwo-oomren'rmnn'r nnvnnorn.

26,1922. Serial No. ceases.

partment is constituted by the body or u n seamed front portion ,1, and the opposite wall 'by a flap or back portion 5, which. is folded overon the broken line' 6 in advance of the folding'on broken line 7 of an opposite side flap or supplemental back portion 8 The -flap 5 is substantially coextensive with the body portion 1, and hence when folded over on the broken-line 6, it is overlapped and partially covered by the lap 8.

the latter, along its edge, having longitudinally spaced portions 9 and '10'which adhere to theflap 5 to form, in effect, a longitudinall v center seam for the larger compartment. .The adhesion of flap 3, when folded over upon the'flaps 5 and 8, provides the bottom seam for the large compartment, and the closure for said large compartment, namely the flap 2, may be used in any manner desired to retain in said compartment the bulky postal matter for which said compartmentc is intended. 1

In addition to the edgewise 1.2, the latter providing, inefi'ect 'the end seams of a smaller compartment or pocket whose .rear and frontv walls, respectively,

A adhesion prov vided by the ,spacedgummed portions 9 and 10, the flap 8 is secured to the flap 5 bythespaced transverse gummed portions 11 and are constituted by the overlapping matching portions "of the flaps 5 and 8 as included be tween the adhesion surfaces 11 and 112. Access to this smaller pocket is-had by way of-the longitudinal. gap, along the edge offiapS, between the gummed portions 9 and 10,-thefe being provided, coextensive with this gap, a sealing extension 13 which is gummedialongits edge, as shown at 14. The letter, invoice, or other postal matter which is mailable'at a higher rate of postage than the bulky matter in the large compartment, is. insertible, as shown in Fig. 1,

, through this gap, so as to lie between the flaps 5 and 8 in the space defined by the ,gummed' portions 11 and,12,and if so desired, said inclosure may be so folded that the address thereon will be disclosed through a window .openingor transparency,

15 which may be formed in-that'part of the flap 8 which constitutes the outer wall of the smaller'pocket. 'Said smaller pocket may then be closed and sealed by moistening and pressing down the gummed edge 1410f projection 13, it'being noted in this connection that an of the amin 9f the blank,

small and large compartments, as indicatedv at 16 and 17.

I claimz.

1. A duplex envelope formed of. a single piece of material having a front portion, a main back portion folded over on to said front portion, a supplemental back portion folded over on to said main back portion and connected to said back portion but free therefrom for a portion of its length, whereby a compartment is formed between said back portions of the depth of said supplemental portion with an opening for the mail matter, and a sealing flap on said supplemental -back portion at its free portion adapted to be connected to said main back portion. s

2. A'duplex envelope formed ofa single piece of material having a front portion, a main back portion folded over on to said front portion, a supplemental back portion folded over on to said main back portion, the opposite end portions of said supplemental back portion being connected to said. main back portion, the intermediate portion of said su plemental back portion being free, where a compartment is formed between said ack portions vof the depth of said supplemental portion with an o ning for the mail matter, and a sealing ap on said supplemental back portion at its intermediate portion adapted to be connected to said main back portion.

3. A duplex envelope formed from a onepiece blank or sheet, the latter consisting of two rectangular portions folded one upon the other to constitute the opposite walls of one compartment, and also consisting ofa third rectangular portion, integral with the other two,sand folded upon and adhesively secured, transversely, to the outside surface of one of said other, two portions, thereby to provide a'second compartment,

said third rectangular portion being free fora portion of the lengthof its longitudinal edge from the other portion to which it is transversely secured, and said free edge portion providing a sealing flap for said second compartment.

'4. As a new article of manufacture, a two compartment envelope formed from a single sheet or blank' the latter having a I rectangular body portion, with opposite side flaps projecting therefrom and adapted to overlap when foldedtoward each other along the edges of said body portion, thereby to form a large compartment between said smaller compartment between said over1apingjside fla s, a longitudinal seam for the ac wall 0 said large compartment being formed by adhesively securing said overlapping flaps together along the free-edge of one of them, said seam having-a gap there .in, to form an entrance to said smaller com- EDWARD w. BURKE .body portion andone of said flaps and-a 

